Characterization of liquid products from pyrolysis of subbituminous coals

Separation of liquid fractions obtained from flash pyrolysis of asphaltite

“…The n-pentane solubles were separated by silica gel chromatography using n-hexane, toluene and methanol as eluents, respectively, to separate aliphatic, aromatic and polar fractions [18,25,27]. The fractionations obtained with flash pyrolysis were characterized by Fourier Transform Infrared Spectroscopy (FTIR) as well as the differences in their aliphatic and aromatic nature [24].…”

“…The oils products were distilled by fractional distillation to separate component. Pentane solubles were fractioned by column chromatography into aliphatic, aromatic and polar fractions using n-hexane, toluene and methanol, respectively [24][25][26][27]. Experiments were performed twice for repeatability.…”

Liquefaction of Harbul (Silopi SE Anatolia, Turkey) Asphaltite by Flash Pyrolysis

“…The asphaltenes were determined as insolubles in n-pentane. The n-pentane solubles were separated by silica gel chromatography using n-hexane, toluene and methanol as eluents, respectively, to separate aliphatic, aromatic and polar fractions [Ekinci et al, 2002]. The results of the column chromatography fractions showing aliphatic, aromatic and polar subfractions of the oil are given in Table 3 and elemental composition of the pyrolysis liquid product and subfractions are shown in Table 4.…”

“…1). Each fraction was dried and weighed and then subjected to elemental and spectroscopic analyses [Khraisha et al, 2003;Ekinci et al, 2002;Özbay et al, 2001].…”

Effect of Coal Liquefaction Conditions on the Composition of the Product Oil

“…Earlier studies revealed that the compounds of oil group consisted of 2 and 3 ring aromatic, hydroaromatic and heteroaromatic compounds and hydrocarbons until C 30 (Filho et al, 2002). Identification of liquefaction products have been performed by using instrumental methods, i.e., high performance liquid chromatography (HPLC), gas chromatography (GC), gas chromatography/mass spectrometry (GC-MS), liquid chromatography/infrared spectrometry (LC-IR), mass spectrometry/mass spectrometry (MS-MS) (Zhang et al, 1997;Ekinci et al, 2002;Filho et al, 2002;Mcclennen et al, 1983;Poirier and Das, 1984).…”